I can’t really support this statement beyond my own contact with recent comp-sci grads, but I’m thinking you won’t get many applicants with significant VB.Net experience, unless that experience was obtained through internships or other extracurricular projects.

I’m under the impression that the average comp-sci curriculum centers around Java and C/C++, with little heed paid to working with an IDE, modeling, design patterns, and good software engineering practices (version control, code modularity, readable code, etc.).